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Old 05-11-2013, 05:20 PM   #16
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Low voltage during outage


I am not an electrician so I pose the question to those that are.

Could this be loss of one leg and voltage leaking through a 240volt appliance i.e. dryer/range/ac?

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Old 05-11-2013, 10:22 PM   #17
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Low voltage during outage


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I am not an electrician so I pose the question to those that are.

Could this be loss of one leg and voltage leaking through a 240volt appliance i.e. dryer/range/ac?

How can there be a leak through a 240 appliance, if there is nothing from the power company traveling through their service wires?
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Old 05-12-2013, 03:08 AM   #18
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Low voltage during outage


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How can there be a leak through a 240 appliance, if there is nothing from the power company traveling through their service wires?
There couldn't be, but so far no one has come up with a better explanation.
Come on guys, doesnt anyone know this one? Could something have happened to the transformer so it really is supplying 60v?
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Old 05-12-2013, 04:44 AM   #19
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Low voltage during outage


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How can there be a leak through a 240 appliance, if there is nothing from the power company traveling through their service wires?

If there was nothing coming through the power companies wires. Then it would be a power source at your son's house that provided the 60 volts.
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Old 05-12-2013, 09:03 AM   #20
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Low voltage during outage


On the day I was there, the streetlights were on, but I am assuming they are on another line across the street.

Back to my sons issue, he told me yesterday that the first time he saw this happen after he moved in, he also noticed on neighbors homes as well and I need to clarify since the explanation below places homes on different neighborhood feeds.

Two things to remember for my son:

First, only thing on in his house that potentially could push anything through the lines of his house were the battery back ups for his computer, TV in den and Comcast modem. None of these were depleted so I feel that it was not a backflow of these.

Second point is his streets power layout. He is at the end of the line on the power poles in his backyard. So there are literally 8 homes and his on this line (4 adjacent to him and 4 on the block behind him). The other 5 homes (facing him) on his cul de sac street along with the 5 homes from behind them, are on another powerline. I am assuming these along with the Streetlights since they are on the same side of the street, I assume??????
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Old 05-12-2013, 09:16 AM   #21
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Low voltage during outage


I'd recheck the recept for the TV.
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Old 05-12-2013, 09:21 AM   #22
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Low voltage during outage


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I'd recheck the recept for the TV.

I assume you mean the UPS?

Its the smallest of the 2 in use. Back-Up ES 500 by APC.

Not sure where you guys got the 60 volts from?????
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Old 05-12-2013, 09:23 AM   #23
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Low voltage during outage


Not always with the streetlights. They would be fed off of a transformer for 3 phase service, and if any of the phases gets cut or knocked out, that feeds the transformer for your son's place, but he still has one phase active, it can cause the service to be half-on/half-off. Is he still having the issue? If so, why hasn't he contacted the power company by now.
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Old 05-12-2013, 09:26 AM   #24
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Low voltage during outage


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I assume you mean the UPS?

Its the smallest of the 2 in use. Back-Up ES 500 by APC.

Not sure where you guys got the 60 volts from?????
60 volts was from RWolff's post about when he had a power problem.

I'd make sure all the recepts on UPS are dedicated and not able to supply power to a light, or switch.

Might have a UPS that is going out.
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Old 05-12-2013, 09:27 AM   #25
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Low voltage during outage


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Not always with the streetlights. They would be fed off of a transformer for 3 phase service, and if any of the phases gets cut or knocked out, that feeds the transformer for your son's place, but he still has one phase active, it can cause the service to be half-on/half-off. Is he still having the issue? If so, why hasn't he contacted the power company by now.

He was suppose to contact them yesterday. We will talk again today.

Remember this issue only happens when the power to his home is off, its back on now and when the power is on, there are no low power issues.

BUT I do realize the urgency to discover the problem regardless of whether the power is on or off.

Will advise more once I talk to him.

Thanks
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Old 05-12-2013, 09:29 AM   #26
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Low voltage during outage


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60 volts was from RWolff's post about when he had a power problem.

I'd make sure all the recepts on UPS are dedicated and not able to supply power to a light, or switch.

Might have a UPS that is going out.


The ups's in use separately ONLY supply power to a single computer, tv and Tivo unit and Comcast modem, there's is built in.
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Old 05-12-2013, 09:33 AM   #27
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Low voltage during outage


If it happens when power is off, you need to keep pressing the utility to come and check things over on their end, from the house to the pole or transformer, along with having an electrician look at the main panel. Most utilities will not open the main panel, but if they suspect it being the culprit, they will open, and if they find something amiss, will pull the meter and "Red" tag the structure, until an licensed electrician fixes the problem, and signs off that it has been fixed.
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Old 05-12-2013, 09:45 AM   #28
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Low voltage during outage


Yes it could be backfeeding through a 240 volt appliance that is still switched on (or breakered on) if one of the two legs is dead.

One of the two legs dead is unlikely due to one of the (usually) three primary lines on the street being dead. But it could well be a break in one of the secondary lines from one particular pole transformer, serving a group of homes. Depending on the location of the break, the backfeeding could be taking place through a 240 volt appliance in a neighboring home.

(In most cases each pole transformer is fed by one primary to provide 120/240 volt secondary output.)
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Last edited by AllanJ; 05-12-2013 at 09:56 AM.
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Old 05-12-2013, 09:48 AM   #29
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Yes it could be backfeeding through a 240 volt appliance that is still switched on (or breakered on).

One of the two legs dead is unlikely due to one of the (usually) three primary lines on the street being dead. But it could well be a break in one of the secondary lines for one particular pole transformer, serving a group of homes.


OK layman here trying to understand what you are saying.

So what you are saying here is that on the UTILITY side, there could be this break that is feeding the low voltage back to these homes via their 240 appliances?
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Old 05-12-2013, 09:53 AM   #30
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Low voltage during outage


This is just a guess, but I'm going to postulate that the poles in front of your house have all three phases on them. If one phase goes out and it's the one your transformer is connected to AND if the load side of that phase is fairly long, then the inductive coupling of the other phases currents can put substantial voltage on the disconnected phase. The power that is coupled is not very much unless you have miles of parallel cable and high voltages. Something the power company has plenty of both.

That's one reason that linemen (and anyone else who works above 1000V) says "It ain't dead until it's dead and GROUNDED".

Mark

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